Macroeconomic is the part of economics that deals with the behavior, structure, and performance of an economy as a whole. It is the broad field to study the behavior of an economy; accordingly, the government makes the decision about what policy should take.

There are two main perspectives of macroeconomic; Keynesian perspective and neoclassical perspective.

Keynesian perspective: Keynesian theory is an economic theory which is a group of various economic theory. This theory is based on the concept to grow and be stable, and active government intervention is required. It shows the effect on output and inflation. It shows how economic output strongly influenced by aggregate demand also aggregate demand does not always equal to the productive capacity of the economy. According to him, aggregate demand influences the factors of production, employment, and inflation in the short run.

Neoclassical economics dominates Keynesian economics. It is an economic theory that focuses on the determination of good, that is, outputs, income distribution in the market through demand and supply. It has few assumptions; people are rational in nature, firms maximize profit, and individuals maximize utility; people have full information. He explains that both customer and producers want to maximize their economic interest, the customer ultimately in control of market forces, that is, price and output. There will be no intervention by the government.

The opportunity cost of time represents the cost of forgiving a few times to get the best use of the time which will take place. For example an air flight, you have to forgo your one hour for the coming two hours approximately; otherwise, your plane will miss.

No there is not always an opportunity for the time as sometimes one is utilizing their time effectively in that work which is most precious for him.